1
我有一個圖形接受一系列文件,逐個處理它們,然後在執行結束時,如果所有執行成功或失敗,程序應該返回成功(0)或失敗(-1)。
這最後一步如何實現?水槽怎麼知道它何時收到最後一個文件的結果?如何在處理所有元素時發出信號?
val graph = createGraph("path-to-list-of-files")
val result = graph.run()
def createGraph(fileOrPath: String): RunnableGraph[NotUsed] = {
printStage("PREPARING") {
val producer: Source[ProducerFile, NotUsed] = Producer(fileOrPath).toSource()
val validator: Flow[ProducerFile, ProducerFile, NotUsed] = Validator().toFlow()
val provisioner: Flow[ProducerFile, PrivisionerResult, NotUsed] = Provisioner().toFlow()
val executor: Flow[PrivisionerResult, ExecutorResult, NotUsed] = Executor().toFlow()
val evaluator: Flow[ExecutorResult, EvaluatorResult, NotUsed] = Evaluator().toFlow()
val reporter: Sink[EvaluatorResult, Future[Done]] = Reporter().toSink()
val graphResult = RunnableGraph.fromGraph(GraphDSL.create() { implicit builder: GraphDSL.Builder[NotUsed] =>
import GraphDSL.Implicits._
producer ~> validator ~> provisioner ~> executor ~> evaluator ~> reporter
ClosedShape
})
printLine("The graph pipeline was created")
graphResult
}